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Expose log1p to Array.

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This commit is contained in:
Gael Guennebaud
2016-06-01 17:00:08 +02:00
parent afd33539dd
commit 89099b0cf7
4 changed files with 31 additions and 3 deletions
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22
Eigen/src/Core/functors/UnaryFunctors.h
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@@ -266,7 +266,7 @@ struct functor_traits<scalar_exp_op<Scalar> > {
*
* \brief Template functor to compute the logarithm of a scalar
*
* \sa class CwiseUnaryOp, Cwise::log()
* \sa class CwiseUnaryOp, ArrayBase::log()
*/
template<typename Scalar> struct scalar_log_op {
EIGEN_EMPTY_STRUCT_CTOR(scalar_log_op)
@@ -293,6 +293,26 @@ struct functor_traits<scalar_log_op<Scalar> > {
};
};
/** \internal
*
* \brief Template functor to compute the logarithm of 1 plus a scalar value
*
* \sa class CwiseUnaryOp, ArrayBase::log1p()
*/
template<typename Scalar> struct scalar_log1p_op {
EIGEN_EMPTY_STRUCT_CTOR(scalar_log1p_op)
EIGEN_DEVICE_FUNC inline const Scalar operator() (const Scalar& a) const { return numext::log1p(a); }
template <typename Packet>
EIGEN_DEVICE_FUNC inline Packet packetOp(const Packet& a) const { return internal::plog1p(a); }
};
template <typename Scalar>
struct functor_traits<scalar_log1p_op<Scalar> > {
enum {
PacketAccess = packet_traits<Scalar>::HasLog1p,
Cost = functor_traits<scalar_log_op<Scalar> >::Cost // TODO measure cost of log1p
};
};
/** \internal
*
* \brief Template functor to compute the base-10 logarithm of a scalar